There are several big glass factories in Japan which do beautiful glasses, though I'm not sure you can really mail order from them. The blue cups shown also look a lot like Bristol Blue Glass which is similar stuff made in the UK; might be easier to track down in the west.
If you really really want to be picky, and are trying to make some sort of display of old fashioned Japanese table settings -
are about as "traditional" as you can get. From what I understand these are the types of glasses that have been around for 100+ years.
omg,
those are beautiful, where did you find them?
In the shadows beneath the trees he waits.
In the darkness under the moon he plots
In the silence of the night he kills.